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cgroup: make debug an implicit controller on cgroup2

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Make debug an implicit controller on cgroup2 which is enabled by
"cgroup_debug" boot param.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Waiman Long <longman@redhat.com>
This commit is contained in:
Tejun Heo 2017-06-14 16:01:32 -04:00
parent 575313f40f
commit 8cc38fa7fa
1 changed files with 56 additions and 3 deletions
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59
kernel/cgroup/debug.c
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@ -240,7 +240,7 @@ static u64 releasable_read(struct cgroup_subsys_state *css, struct cftype *cft)
!css_has_online_children(&css->cgroup->self)); !css_has_online_children(&css->cgroup->self));
} }
static struct cftype debug_files[] = { static struct cftype debug_legacy_files[] = {
{ {
.name = "taskcount", .name = "taskcount",
.read_u64 = debug_taskcount_read, .read_u64 = debug_taskcount_read,
@ -287,9 +287,62 @@ static struct cftype debug_files[] = {
{ } /* terminate */ { } /* terminate */
}; };
static struct cftype debug_files[] = {
{
.name = "taskcount",
.read_u64 = debug_taskcount_read,
},
{
.name = "current_css_set",
.seq_show = current_css_set_read,
.flags = CFTYPE_ONLY_ON_ROOT,
},
{
.name = "current_css_set_refcount",
.read_u64 = current_css_set_refcount_read,
.flags = CFTYPE_ONLY_ON_ROOT,
},
{
.name = "current_css_set_cg_links",
.seq_show = current_css_set_cg_links_read,
.flags = CFTYPE_ONLY_ON_ROOT,
},
{
.name = "css_links",
.seq_show = cgroup_css_links_read,
},
{
.name = "csses",
.seq_show = cgroup_subsys_states_read,
},
{
.name = "masks",
.seq_show = cgroup_masks_read,
},
{ } /* terminate */
};
struct cgroup_subsys debug_cgrp_subsys = { struct cgroup_subsys debug_cgrp_subsys = {
.css_alloc = debug_css_alloc, .css_alloc = debug_css_alloc,
.css_free = debug_css_free, .css_free = debug_css_free,
.legacy_cftypes = debug_files, .legacy_cftypes = debug_legacy_files,
.dfl_cftypes = debug_files,
}; };
/*
* On v2, debug is an implicit controller enabled by "cgroup_debug" boot
* parameter.
*/
static int __init enable_cgroup_debug(char *str)
{
debug_cgrp_subsys.dfl_cftypes = debug_files;
debug_cgrp_subsys.implicit_on_dfl = true;
return 1;
}
__setup("cgroup_debug", enable_cgroup_debug);